Some churches encounter systemic disunity. Perhaps they are filled with people who inadvertently gave the Devil a foothold. It can happen through unrighteous anger (Ephesians 4:27), conceit (1 Timothy 3:6-7), opposition (2 Timothy 2:26), gullibility (1 Peter 5:8), laziness (James 4:7), or just walking around unprotected in his world (Ephesians 6:11). There are other ways the Devil gets a foothold, but if none of the usual strategies can be identified, a good place to go is Proverbs 6:16-19. This is a list of stuff God hates. This a list of stuff HE says HE hates. Those who sow discord among the brethren is number 7. We can reasonably approach divisive people and say with confidence, “Hey pal, God hates what you’re doing. So stop it”. Tell the truth and shame the Devil.